S390: Allowing a NOP instruction without operands

[Nick Clifton]

Hi Martin,

  A Fedora user recently filed a binutils bug report about the NOP
  instruction for the s390:

    https://bugzilla.redhat.com/show_bug.cgi?id=506417

  In it they report that the s390's NOP instruction has to have some
  operands specified, which seems rather counter-intuitive given that
  it does not do anything.

  I have proposed a patch (attached here and also available via that
  bugzilla page) to allow the assembler to ignore any missing operands
  when a NOP instruction is found.  What do you think ?  Would this be
  OK for the s390 port or is there a reason why the NOP instruction
  should take some parameters ?

Cheers
  Nick

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